HL2036/8036 Series FCU Thermostat

The HL2036/8036 Series FCU Thermostat is designed for precise room temperature control in residential, commercial, and building HVAC applications. With an acrylic mirror display and touch buttons, it provides intuitive control of standard AC three-speed fan coil units and on/off electric valves. Selected models feature RS-485 communication with Modbus-RTU, enabling integration with building automation and centralized HVAC control systems.

The series supports both 2-pipe and 4-pipe fan coil systems, with multiple models available for different fan operation, timer, input, and communication requirements. This makes the HL2036/8036 Series suitable for individual room control as well as larger building automation applications.

Key Features

• 3-Speed FCU Fan Control – Controls standard AC three-speed fan coil units for flexible airflow management.
• BLDC Motor Fan Control – Supports efficient fan control for compatible BLDC motor applications.
• Large Backlit Display – Provides clear visibility of room temperature and operating status.
• Touch Button Operation – Offers convenient and intuitive local temperature and HVAC control.
• On/Off Valve Control – Controls on/off electric valves for heating and cooling applications.
• 2-Pipe and 4-Pipe Compatibility – Available in configurations for different fan coil system architectures.
• RS-485 Modbus-RTU Communication – Selected models can connect with building control and management systems.
• Programmable Schedule – Supports scheduled HVAC operation for different occupancy periods.
• On/Off Timer – Provides timed equipment operation for convenient room control.
• Button Lock – Helps prevent unauthorized or accidental changes to thermostat settings.
• Anti-Freezing Protection – Helps protect the HVAC system during low-temperature conditions.
• Configurable Hysteresis – Allows temperature control parameters to be adjusted for different applications.
• Power Restoration Function – Maintains the configured operating behavior after power is restored.

Precise Room Temperature Control for Fan Coil Units

A fan coil thermostat acts as the room-level control interface between the occupant and the fan coil unit. It detects room temperature, compares it with the configured setpoint, and controls the fan and valve operation to maintain the desired indoor environment.

The HL2036/8036 Series combines temperature control, fan speed selection, valve switching, scheduling, and optional building automation communication in one wall-mounted thermostat. This makes it suitable for applications where reliable room-level HVAC control is required.

For building projects, the thermostat can also work as part of a wider HVAC automation architecture. HaiLin Controls provides thermostats, sensors, controllers, gateways, valves, and management platforms for integrated building automation systems.

2-Pipe and 4-Pipe FCU System Compatibility

The HL2036/8036 Series includes models for both 2-pipe and 4-pipe fan coil units.

2-Pipe Fan Coil Systems

In a 2-pipe FCU system, the same water circuit is used for heating or cooling depending on the building's operating mode. The thermostat controls the fan and valve according to the required room temperature and system configuration.

4-Pipe Fan Coil Systems

In a 4-pipe system, separate heating and cooling circuits allow heating and cooling functions to be controlled independently. This configuration is commonly used where different rooms or zones may have different thermal requirements.

Offering both configurations allows the series to adapt to different HVAC system designs without requiring a single thermostat configuration for every project.

3-Speed Fan and Valve Control

The HL2036/8036 Series is designed to control AC three-speed fan coil units and on/off electric valves.

Users can select the appropriate fan speed according to room comfort requirements, while the thermostat manages valve operation according to the configured temperature control logic. This provides a practical solution for room-level HVAC control in offices, hotels, residential buildings, healthcare facilities, and other commercial environments.

The combination of fan speed and valve control is a core requirement of FCU thermostats. Major HVAC control manufacturers similarly specify fan coil thermostats according to fan-speed control, valve control, heating/cooling operation, and system configuration.

RS-485 Modbus-RTU for Building Automation

Selected HL8036 Series models include an RS-485 interface and support Modbus-RTU communication.

This allows the thermostat to exchange operating information with compatible building control systems. In a centralized HVAC environment, room-level thermostats can form part of a wider control architecture involving controllers, sensors, valves, gateways, and building management platforms.

This communication capability is particularly useful for commercial buildings and projects requiring centralized monitoring, configuration, and HVAC management.

HaiLin Controls' building automation portfolio includes DDC controllers, gateways, sensors, thermostats, automatic valves, and management platforms, providing the components required to build integrated HVAC automation systems.

Programmable Schedule and Timer Control

The series provides programmable scheduling and on/off timer functions on selected models.

Scheduled control can be used to align HVAC operation with occupancy patterns, such as:

• Office working hours
• Hotel room occupancy
• Residential daily schedules
• Commercial building operating periods
• Public building operating hours

By coordinating HVAC operation with actual usage periods, room-level control can contribute to more efficient building operation.

HaiLin's building automation solutions also emphasize scheduled HVAC operation, zone-based management, and automated room control as part of energy-efficient building management.

User-Friendly Display and Touch Control

The HL2036/8036 Series uses an acrylic mirror cover display with touch buttons, combining a clean appearance with convenient operation.

The large backlit display provides clear visual information, while touch control allows users to adjust room settings without complicated operation. The button lock function can help prevent unintended changes in public or managed environments.